EP2615445B1 - Method of measuring a diffusion characteristic value of a particle - Google Patents

Method of measuring a diffusion characteristic value of a particle Download PDF

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Publication number
EP2615445B1
EP2615445B1 EP11832447.4A EP11832447A EP2615445B1 EP 2615445 B1 EP2615445 B1 EP 2615445B1 EP 11832447 A EP11832447 A EP 11832447A EP 2615445 B1 EP2615445 B1 EP 2615445B1
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Prior art keywords
light
detection region
emitting particle
particle
time
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German (de)
English (en)
French (fr)
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EP2615445A1 (en
EP2615445A4 (en
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Tetsuya Tanabe
Mitsushiro Yamaguchi
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Olympus Corp
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Olympus Corp
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/02—Investigating particle size or size distribution
    • G01N15/0205—Investigating particle size or size distribution by optical means, e.g. by light scattering, diffraction, holography or imaging
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/645—Specially adapted constructive features of fluorimeters
    • G01N21/6456—Spatial resolved fluorescence measurements; Imaging
    • G01N21/6458—Fluorescence microscopy
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Electro-optical investigation, e.g. flow cytometers
    • G01N15/1434—Electro-optical investigation, e.g. flow cytometers using an analyser being characterised by its optical arrangement
    • G01N15/1436—Electro-optical investigation, e.g. flow cytometers using an analyser being characterised by its optical arrangement the optical arrangement forming an integrated apparatus with the sample container, e.g. a flow cell
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B21/00—Microscopes
    • G02B21/0004—Microscopes specially adapted for specific applications
    • G02B21/002—Scanning microscopes
    • G02B21/0024—Confocal scanning microscopes (CSOMs) or confocal "macroscopes"; Accessories which are not restricted to use with CSOMs, e.g. sample holders
    • G02B21/0052—Optical details of the image generation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B21/00—Microscopes
    • G02B21/0004—Microscopes specially adapted for specific applications
    • G02B21/002—Scanning microscopes
    • G02B21/0024—Confocal scanning microscopes (CSOMs) or confocal "macroscopes"; Accessories which are not restricted to use with CSOMs, e.g. sample holders
    • G02B21/0052—Optical details of the image generation
    • G02B21/0076—Optical details of the image generation arrangements using fluorescence or luminescence
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B21/00—Microscopes
    • G02B21/0004—Microscopes specially adapted for specific applications
    • G02B21/002—Scanning microscopes
    • G02B21/0024—Confocal scanning microscopes (CSOMs) or confocal "macroscopes"; Accessories which are not restricted to use with CSOMs, e.g. sample holders
    • G02B21/008—Details of detection or image processing, including general computer control

Definitions

  • This invention relates to an optical analysis method capable of detecting light from a particulate object, e.g. an atom, a molecule or an aggregate thereof (Hereafter, these are called a "particle”.), such as a biological molecule, for example, protein, peptide, nucleic acid, lipid, sugar chain, amino acid or these aggregate, virus and cell, etc., or a non-biological particle, dispersed or dissolved in a solution, by using an optical system, such as the optical system of a confocal microscope or a multiphoton microscope, which can detect light from a micro region in a solution, to acquire useful information in an analysis of conditions (interaction, binding or dissociating condition, etc.) of particles, and more specifically, relates to a method of detecting the light from a single particle which emits light individually, using an optical system as described above, to make it possible to conduct various optical analyses.
  • a particulate object e.g. an atom, a molecule or an aggregate thereof (Here
  • a particle which emits light may be any of a particle which itself emits light and a particle to which an arbitrary light-emitting label has been attached, and the light emitted from a light-emitting particle may be fluorescence, phosphorescence, chemiluminescence, bioluminescence, scattered light, etc.
  • patent documents 1-3 and non-patent documents 1-3 by means of the optical system of a laser confocal microscope and a photon counting technique, there is performed the measurement of fluorescence intensity of fluorescent molecules or fluorescently labeled molecules (fluorescent molecules, etc.), entering into and exiting out of a micro region (the focal region to which the laser light of the microscope is condensed, called a "confocal volume”) in a sample solution, and based on the average dwell time (translational diffusion time) of the fluorescent molecules, etc.
  • a micro region the focal region to which the laser light of the microscope is condensed
  • patent document 5 there is generated a histogram of fluorescence intensity of fluorescent molecules, etc., entering into and exiting out of a confocal volume, measured similarly to FCS; and the average value of the characteristic brightness of the fluorescent molecules, etc. and the average number of molecules dwelling in the confocal volume are calculated by fitting a statistical model formula to the distribution of the histogram, so that, based on the information thereof, the structure or size changes, binding or dissociative conditions or dispersion and aggregation conditions of molecules can be estimated.
  • Patent documents 6 and 7 there are proposed methods of detecting fluorescent substances based on a time progress of fluorescence signals of a sample solution measured using the optical system of a confocal microscope.
  • Patent document 8 has proposed a signal calculation processing technique for measuring faint light from fluorescent fine particles flowing through a flow cytometer or fluorescent fine particles fixed on a substrate by a photon counting technique to detect the existences of the fluorescent fine particles in the flow or on the substrate.
  • a sample amount required for the measurement may be extremely small (an amount used in one measurement is at most several tens of ⁇ L), and its concentration is extremely low as compared with the prior art, and the measuring time is also shortened extremely (In one measurement, a measuring process for time of order of seconds is repeated several times.).
  • those techniques are expected to be a strong tool enabling an experiment or a test at low cost and/or quickly in comparison with conventional biochemical methods, especially in conducting an analysis of a rare or expensive sample often used in the field of the medical or biological research and development or in conducting tests of a large number of specimens, such as sick clinical diagnosis or the screening of bioactive substances.
  • Spatial and temporal correlation is then applied to the image time-series using a temporal correlation function determined by comparing images in the series which differ in time of imaging by Td to determine for each T an average value of the correlation function at this time T. This procedure is repeated for different values of T to obtain a new average value of the correlation function at different time delays T.
  • the temporal decay rate of the correlation function is determined for a sample situation in which two dimensional diffusion is dominant so as to permit a best fit characteristic diffusion time Td from which the diffusion coefficient can be directly calculated using the particle velocity.
  • the measured light is the light emitted from single or several fluorescent molecules
  • the statistical procedures for the calculating of the fluorescence intensity fluctuation, etc. such as the computation of the autocorrelation function or the fitting to the histogram of fluorescence intensity data measured in time series, and therefore the signal of the light from an individual fluorescent molecule is not seen or analyzed. That is, in these optical analysis techniques, through the statistical processing of the signals of the lights from a plurality of fluorescent molecules, etc., statistical average characteristics of the fluorescent molecules, etc. will be detected.
  • the concentration or number density of a fluorescent molecule, etc. to be an observation object in the sample solution should be at a level so that fluorescent molecules, etc. of the number enabling a statistical process will enter in and exit from a micro region in one measuring term of a length of order of seconds in an equilibrium, preferably at a level so that about one fluorescent molecule, etc. will be always present in the micro region.
  • the volume of a confocal volume is about 1 fL, the concentration of a fluorescent molecule, etc.
  • Applicant of the present application has proposed an optical analysis technique based on a new principle which makes it possible to observe quantitatively a condition or characteristic of a light-emitting particle in a sample solution where the concentration or number density of the light-emitting particle to be an observation object is lower than the level at which the optical analysis techniques including statistical procedures, such as FCS and FIDA, etc. are used.
  • an optical system which can detect light from a micro region in a solution, such as an optical system of a confocal microscope or a multiphoton microscope, similarly to FCS, FIDA, etc., and additionally, the position of the micro region, i.e.
  • the detection region of light (called “light detection region” in the following) is moved in the sample solution, namely, the inside of the sample solution is scanned with the light detection region, and when the light detection region encompasses a light-emitting particle, dispersed and moving at random in the sample solution, the light emitted from the light-emitting particle is detected, and thereby each of the light-emitting particles in the sample solution is detected individually so that it becomes possible to perform the counting of light-emitting particles and the acquisition of the information about the concentration or number density of the light-emitting particle in the sample solution.
  • a sample amount necessary for measurement may be small (for example, about several 10 ⁇ L) and the measuring time is short similarly to optical analysis techniques, such as FCS and FIDA, but also, it becomes possible to detect the presence of a light-emitting particle and to quantitatively detect its characteristic, such as a concentration, a number density, etc., at a lower concentration or number density, as compared with the case of optical analysis techniques, such as FCS and FIDA.
  • the light detection region is moved so as to circulate through a predetermined, e.g., circular or elliptical, route.
  • a predetermined e.g., circular or elliptical
  • the main object of the present invention is to provide a new method of measuring an index value which indicates the easiness of the moving of a light-emitting particle owing to the Brownian motion, typically, the diffusion constant of a light-emitting particle by using a detection method of a light-emitting particle of the scanning molecule counting method.
  • another object of the present invention is to provide a method of measuring an index value which indicates the easiness of the moving of a light-emitting particle owing to the Brownian motion or a diffusion constant of a light-emitting particle in a sample solution at a lower concentration than a light-emitting particle concentration measurable in good accuracy by optical analysis techniques, such as FCS.
  • a method of measuring a diffusion characteristic value of a light-emitting particle dispersed and moving at random in a sample solution using an optical system of a confocal microscope or a multiphoton microscope comprises steps of: moving periodically along a predetermined route a position of a light detection region of the optical system of the microscope in the sample solution by changing an optical path of the optical system; measuring light intensity from the light detection region with moving the position of the light detection region in the sample solution to generate light intensity data; individually detecting a signal indicating light of a light-emitting particle on the light intensity data; extracting two or more signals corresponding to a same light-emitting particle among the detected signals indicating light of the light-emitting particle; and computing a diffusion characteristic value of the light-emitting particle corresponding to the extracted signals based on a deviation time from a moving cycle time of the light detection region in an interval of generation times of the extracted signals.
  • a light-emitting particle dispersed and moving at random in a sample solution may be a particle, such as an atom, a molecule or an aggregates of these, which is dispersed or dissolved in a sample solution and emits light, and it may be an arbitrary particulate matter making the Brownian motion freely in a solution without being fixed on a substrate, etc.
  • the light-emitting particle is typically a fluorescent particle, but may be a particle which emits light by phosphorescence, chemiluminescence, bioluminescence, light scattering, etc.
  • the "light detection region" of the optical system of the confocal microscope or multiphoton microscope is the micro region where light is detected in those microscopes, which region corresponds to the region to which illumination light is condensed when the illumination light is given from an objective (Especially in a confocal microscope, this region is determined in accordance with the spatial relationship of an objective and a pinhole.
  • a light-emitting particle which emits light without illumination light for example, a molecule which emits light according to chemiluminescence or bioluminescence, no illumination light is required in the microscope.).
  • the "diffusion characteristic value" may be an arbitrary index value which indicates the easiness of the moving of a particle owing to the Brownian motion, and typically, it may be a diffusion constant of a particle, but it may also be the other physical quantities, such as a translational diffusion time, an arbitrary function of the diffusion constant.
  • a signal means “a signal expressing light from a light-emitting particle” unless noted otherwise.
  • the measurement of light intensity is sequentially performed while the position of a light detection region is moved in the sample solution, namely, while the inside of the sample solution is scanned with the light detection region. Then, when the moving light detection region encompasses a randomly moving light-emitting particle, the light from the light-emitting particle is detected by the light detecting portion, and thereby, the existence of one particle will be detected.
  • the light detection region in a case that the light detection region is periodically moved along a predetermined route, until the light detection region goes around the predetermined route after encompassing a certain light-emitting particle in a certain position and reaches near the position where it has encompassed the light-emitting particle, if the light-emitting particle does not deviate from the predetermined route of the light detection region, the light-emitting particle will be encompassed again in the light detection region and its light will be detected.
  • the position of the light-emitting particle moves owing to the Brownian motion during the light detection region going around the predetermined route, and therefore, the interval between the first time that the light-emitting particle was detected and the next time it was detected, i.e., the interval between the generation times of the signals of the light-emitting particle is not completely equal to, but deviated from, the moving cycle time of the light detection region, and it is expected that this deviation time from the moving cycle time of the light detection region reflects the easiness of the moving of the light-emitting particle owing to the Brownian motion.
  • two or more signals which correspond to the same light-emitting particle among the detected signals indicating lights of the light-emitting particles on light intensity data are extracted, and the diffusion characteristic value of the light-emitting particle corresponding to the extracted signals is computed based on the deviation time from the moving cycle time of the light detection region in the interval between the generation times of those extracted signals.
  • a light-emitting particle when a light-emitting particle enters into a predetermined route of a light detection region, its diffusion characteristic value can be individually measured, and therefore, no statistical procedures for calculation of fluorescence intensity fluctuation in optical analysis techniques, such as FCS, are required, and it is advantageous in that the diffusion characteristic value of a light-emitting particle can be obtained even when the light-emitting particle concentration in a sample solution is lower than a level necessary to obtain a good measurement result in FCS. Moreover, because a diffusion characteristic value is computed based on generation times of signals on light intensity data (one-dimensional data) according to the inventive method, it is also advantageous in that calculation load does not become so large.
  • the displacement of a light-emitting particle detected by the above-mentioned method is computed from the deviation time from the cycle time of a light detection region in the interval of generation times of signals extracted as signals of the same light-emitting particle on light intensity data and the moving speed of the light detection region.
  • the displacement of a light-emitting particle may be computed first, and, based on the displacement of the light-emitting particle, the diffusion characteristic value of the light-emitting particle may be computed.
  • the interval of generation times of signals extracted as signals of the same light-emitting particle on light intensity data may not always be the difference between the generation times of the signals adjoining in time but the time difference between generation times of any two signals in the two or more continuous, extracted signals.
  • the intervals of generation times of two signals of all the combinations of two in the n signals may be used for calculation of a diffusion characteristic value or a diffusion constant. That is, when n signals are extracted, n (n-1)/2 of the interval values between generation times of signals are obtained, and a diffusion characteristic value or a diffusion constant may be computed using the values of those generation time intervals. According to this way, it is advantageous in that much displacement values will be obtained in a short measuring time and a reliable calculating result is obtained as compared with a case that a displacement of a particle is measured subsequently from the difference between generation times of adjoining signals.
  • a signal generated within a time width, determined based on the size and moving speed of the light detection region, from the time obtained by adding the cycle time of the light detection region to a generation time of one signal among detected signals indicating lights of light-emitting particles may be judged as a signal of the same light-emitting particle as the light-emitting particle corresponding to the above-mentioned one signal.
  • the same light-emitting particle is detected periodically each time the light detection region has circulated through a predetermined route (not by pursuing one light-emitting particle continuously), and a diffusion characteristic value or a diffusion constant is computed from the interval or displacement of generation times of the signals.
  • a diffusion characteristic value or a diffusion constant is so large that the (average) displacement of the light-emitting particle exceeds beyond the size of the light detection region, it is possible that the signal of the same light-emitting particle cannot be periodically detected.
  • the interval of the signals of the light-emitting particle becomes within the range of the value given by adding to, or subtracting from, the cycle time of the light detection region a half of the time width taken for the light detection region to move the size of the light detection region.
  • the time width taken for the light detection region to move the size of the light detection region is determined based on the size and moving speed of the light detection region, and therefore, after all, it is considered that a certain signal, and another signal which has been generated within the range of the value given by adding to, or subtracting from, the cycle time of the light detection region a half of the time width determined based on the size and moving speed of the light detection region from the generation of the certain signal, are the signals of the same light-emitting particle.
  • a diffusion characteristic value or diffusion constant may be independently computed for each of those two or more light-emitting particles.
  • a diffusion characteristic value or diffusion constant may be independently computed for each of those two or more light-emitting particles.
  • the inventive method when two or more light-emitting particles exist on a predetermined route during the circulation of a light detection region through the route, those are detected independently. Accordingly, by extracting the signals of those light-emitting particles for the respective light-emitting particles, diffusion characteristic values or diffusion constants can be computed for the respective ones. According to this structure, it is advantageous in that diffusion characteristic values or diffusion constants of two or more light-emitting particles on one light intensity data can be obtained, and many results are obtained in a short measuring time.
  • the moving speed of the position of the light detection region in the sample solution is appropriately changed based on the characteristic or the number density or concentration of the light-emitting particle in the sample solution.
  • the condition of detected light from the light-emitting particle may change in accordance with its characteristic, number density or concentration in the sample solution.
  • the moving speed of the light detection region becomes quick, the amount of light obtained from one light-emitting particle will be reduced, and therefore it is preferable that the moving speed of the light detection region can be changed appropriately so that the light from one light-emitting particle can be measured precisely or with sufficient sensitivity.
  • the moving speed of the position of the light detection region in the sample solution is preferably set to be higher than the diffusional moving velocity of a light-emitting particle (the average moving speed of a particle owing to the Brownian motion).
  • a light-emitting particle will be detected individually by detecting the light emitted from the light-emitting particle encompassed by the light detection region.
  • the moving speed of the light detection region is set higher than the diffusional moving velocity of the light-emitting particle, and thereby it becomes possible to make one light-emitting particle correspond to one signal (during one circulation of the light detection region through a predetermined route).
  • the moving speed of the light detection region can be changed appropriately according to the characteristics (especially, the diffusion characteristic value or diffusion constant) of the light-emitting particle as described above.
  • the changing of the optical path of the optical system for moving the position of the light detection region may be done in an arbitrary way.
  • the position of the light detection region may be changed by changing the optical path using a galvanomirror employed in the laser scan type optical microscope.
  • the movement route of the position of the light detection region may be set arbitrarily, for example, which is selectable from circular, elliptical, rectangular, straight and curvilinear ones.
  • the position of the light detection region is moved by changing the optical path of an optical system, the movement of the light detection region is quick without substantial generation of mechanical vibration and hydrodynamic effect in the sample solution, and therefore, the measurement of light can be performed under a stable condition without dynamic action affecting the light-emitting particle in the sample solution (without artifact)
  • the device structure would become complicated, and furthermore, not only the required sample amount is substantially increased, but also it is possible that light-emitting particles or other substances in a solution would deteriorate or be denaturalized by the hydrodynamic action of the flow.
  • the inventive method is used, typically, for an analysis of a condition in a solution of a biological particulate object, such as a biological molecule, e.g. a protein, a peptide, a nucleic acid, a lipid, a sugar chain, an amino acid or these aggregate, a virus and a cell, etc., but it may be used for an analysis of a condition in a solution of a non-biological particle (for example, an atom, a molecule, a micelle, a metallic colloid, etc.), and it should be understood that such a case belongs to the scope of the present invention also.
  • a biological particulate object such as a biological molecule, e.g. a protein, a peptide, a nucleic acid, a lipid, a sugar chain, an amino acid or these aggregate, a virus and a cell, etc.
  • a non-biological particle for example, an atom, a molecule, a micelle, a metallic colloid
  • the inventive method as well as detecting an existence of a light-emitting particle individually by scanning the inside of a sample solution with a light detection region in a confocal microscope or a multiphoton microscope, the measurement of a diffusion characteristic value or a diffusion constant of the light-emitting particle becomes possible.
  • the diffusion characteristic value or diffusion constant reflects the size and shape of the particle, and therefore, in accordance with the measurement by the inventive method, the identification of a particle, the detection of the size, shape their changes of a particle, or the detection and analysis of various phenomena, such as a binding and dissociation reaction or dispersion and aggregation of particles becomes possible.
  • the measurement of a diffusion characteristic value or a diffusion constant in the above-mentioned inventive method is based on a new principle, having some features different from the conventional measurement or estimating method of a diffusion constant.
  • FCS the translational diffusion time of a light-emitting particle dispersed and moving at random in a sample solution is computed and it is possible to estimate a diffusion constant of the light-emitting particle from the translational diffusion time; however, the translational diffusion time of FCS is a value obtained from an autocorrelation function of the fluorescence intensity in a measuring time which has been computed, and the diffusion constant computed therefrom is the average value of many light-emitting particles in a sample solution.
  • the light-emitting particle concentration in a sample solution needs to be a level at which one or more light-emitting particle(s) always exist(s) in the measuring time.
  • the inventive method it is possible to compute the individual diffusion characteristic value or diffusion constant of a particle by detecting an existence of the particle and its position individually.
  • the light-emitting particle concentration in the sample solution at which the measurement can be performed in good precision may be significantly lower than the case of FCS, and in a case that kinds of light-emitting particle can be discriminated with signal characteristics, etc., whether or not different kinds of light-emitting particle are present in a sample solution seldom influences the difficulty in calculation of a diffusion characteristic value or a diffusion constant, and thus, it is advantageous in that the removal of the light-emitting probes are not necessary even in a case of the measuring of particles to which light-emitting probes have been attached.
  • a diffusion characteristic value or a diffusion constant is computed using one-dimensional data (time series light intensity data), and accordingly, the operational load is lighter than the analysis operation of image data, and also, by adjusting appropriately the moving speed and/or route length of the light detection region, the diffusion constant of a quickly moving particle (as compared with the cases of SMT and RICS) can be measured individually for each light-emitting particle.
  • the method according to the present invention can be realized with an optical analysis device constructed by associating the optical system of a confocal microscope and a photodetector, enabling FCS, FIDA, etc., as schematically illustrated in Fig. 1 (A) .
  • the optical analysis device 1 consists of an optical system 2-17 and a computer 18 for acquiring and analyzing data together with controlling the operation of each part in the optical system.
  • the optical system of the optical analysis device 1 may be the same as the optical system of a usual confocal microscope, where laser light emitted from a light source 2 and transmitted through the inside of a single mode fiber 3 (Ex) forms light diverging to be radiated at the angle decided by an inherent NA at the emitting end of the fiber; and after forming a parallel beam with a collimator 4, the light is reflected on a dichroic mirror 5 and reflective mirrors 6 and 7, entering into an objective 8.
  • the objective 8 typically, there is placed a sample container or a micro plate 9 having wells 10 arranged thereon, to which one to several tens of ⁇ L of a sample solution is dispensed, and the laser light emitted from the objective 8 is focused in the sample solution in the sample container or well 10, forming a region having strong light intensity (excitation region).
  • light-emitting particles to be observed objects which are typically molecules to which a light emitting label such as a fluorescent dye is attached, are dispersed or dissolved, and when a light-emitting particle enters into the excitation region, the light-emitting particle is excited and emits light during dwelling in the excitation region.
  • the pinhole 13 is located at a conjugate position of the focal position of the objective 8, and thereby only the light emitted from the focal region of the laser light, i.e., the excitation region, as schematically shown in Fig. 1 (B) , passes through the pinhole 13 while the light from regions other than the focal plane is blocked.
  • confocal volume typically, the light intensity is spread in accordance with a Gaussian type or Lorentz type distribution having the peak at the center of the region, and the effective volume is a volume of an approximate ellipsoid bordering a surface where the light intensity reduced to 1/e 2 of the peak intensity.
  • the light having passed through the pinhole 13 passes through the dichroic mirror 14a and transmits through the corresponding barrier filter 14 (where a light component only in a specific wavelength band is selected); and is introduced into a multimode fiber 15, reaching to the corresponding photodetector 16, and after the conversion into time series electric signals, the signals are inputted into the computer 18, where the processes for optical analyses are executed in manners explained later.
  • the photodetector 16 preferably, a super high sensitive photodetector, usable for the photon counting, is used, so that the light from one light-emitting particle, for example, the faint light from one or several fluorescent dye molecule(s), can be detected.
  • a mechanism for changing the optical path of the optical system to scan the inside of the sample solution with the light detection region namely to move the position of the focal region i.e., the light detection region, within the sample solution.
  • a mirror deflector 17 which changes the direction of the reflective mirror 7, as schematically illustrated in Fig. 1 (C) .
  • This mirror deflector 17 may be the same as that of a galvanomirror device equipped on a usual laser scan type microscope.
  • the mirror deflector 17 is driven in harmony with the light detection of the photodetector 16 under the control of the computer 18.
  • the movement route of the position of the light detection region may be arbitrarily selected from circular, elliptical, rectangular, straight and curvilinear ones, or a combination of these (The program in the computer 18 may be designed so that various moving patterns can be selected.).
  • the position of the light detection region may be moved in the vertical direction by moving the objective 8 up and down.
  • stage position changing apparatus 17a for moving the horizontal position of the micro plate 9, in order to change the well 10 to be observed.
  • the operation of the stage position changing apparatus 17a may be controlled by the computer 18.
  • the above-mentioned optical system is used as a multiphoton microscope. In that case, since the light is emitted only from the focal region of the excitation light (light detection region), the pinhole 13 may be removed.
  • the above-mentioned optical system of the confocal microscope is used as it is. Further, in the case that a light-emitting particle emits light owing to a chemiluminescence or bioluminescence phenomenon without excitation light, the optical system 2-5 for generating excitation light may be omitted.
  • two or more excitation light sources 2 may be provided so that the wavelength of the excitation light can be appropriately selected in accordance with the wavelength of the light for exciting a light-emitting particle.
  • two or more photodetectors 16 may also be provided so as to detect the lights from light-emitting particles of two or more kinds having different light-emitting wavelengths, if contained in a sample, separately depending upon the wavelengths.
  • the inventive method which detects individually an existence of a light-emitting particle dispersed in a sample solution by detecting light emitted by the light-emitting particle when it is encompassed in a light detection region of a confocal microscope or a multiphoton microscope during the periodic moving of the position of the light detection region through a predetermined route within the sample solution, there is computed the easiness of the moving of the light-emitting particle, i.e., the diffusion characteristic value or the diffusion constant of the light-emitting particle based on the deviation times from the moving cycle time of the light detection region in the intervals of generation times of signals of the light-emitting particle reflecting the displacements of the position of the light-emitting particle during the circulation of the light detection region through the predetermined route.
  • each of the light-emitting particles in the sample solution is detected individually and its diffusion characteristic value or diffusion constant is measured individually, and therefore, even when the light-emitting particle concentration in the sample solution is lower than the concentration well measurable in spectral analysis techniques, such as FCS, etc., which require a statistical procedure for calculation of the magnitude of fluorescence fluctuation, a measurement of the diffusion characteristic value or diffusion constant of the light-emitting particle becomes possible.
  • spectral analysis techniques such as FCS, etc.
  • Spectral analysis techniques such as FCS, etc.
  • FCS Spectral analysis techniques
  • the characteristics of a light-emitting particle are principally computed based on the fluorescence intensity fluctuation, and therefore, in order to obtain accurate measurement results, the concentration or number density of the light-emitting particle in a sample solution should be at a level where about one light-emitting particle always exists in a light detection region CV during the fluorescence intensity measurement as schematically drawn in Fig. 10(A) so that significant light intensity (photon count) can be always detected in the measuring term as shown in the right-hand side of the drawing.
  • the concentration or number density of the light-emitting particle is lower than that, for example, at the level where the light-emitting particle rarely enters into the light detection region CV as drawn in Fig. 10(B) , no significant light intensity signal (photon count) would appear in a part of the measuring term as illustrated in the right-hand side of the drawing, and thus, accurate computation of light intensity fluctuation would become difficult. Also, when the concentration of the light-emitting particle is significantly lower than the level where about one light-emitting particle always exists in the inside of the light detection region during the measurement, the calculation of light intensity fluctuation would become subject to the influence of the background, and the measuring term should be made long in order to obtain the significant quantity of the light intensity data (photon count) sufficient for the calculation.
  • the light detection is performed together with moving the position of the light detection region CV in a sample solution, namely, scanning the inside of the sample solution with the light detection region CV by driving the mechanism (mirror deflector 17) for moving the position of the light detection region to change the optical path as schematically drawn in Fig. 2 . Then, for example, as in Fig.
  • a light detection region (CV) is made circulate so as to pass through a predetermined route (for example, a ring of radius R) in a sample solution.
  • a predetermined route for example, a ring of radius R
  • the position of a light-emitting particle moves owing to the Brownian motion, and when a light-emitting particle detected once (a light-emitting particle once encompassed in the light detection region) does not deviate from the spatial region through which the light detection region passes during the circulation of the light detection region through the predetermined route, this light-emitting particle will be detected again.
  • the light-emitting particle detected once will be encompassed in the light detection region at each circulation of the light detection region in a certain term, and accordingly, on light intensity data, as schematically illustrated in Fig. 3 (B) , signals indicating light of the light-emitting particle are periodically detected almost by the time (moving cycle time) tcycle of one circulation of the light detection region through the predetermined route.
  • the intervals of generation times of periodically detected signals are not completely equal to the moving cycle time of the light detection region, and increases and/or decreases relative to the moving cycle time of the light detection region depending on the movement of the position of the light-emitting particle owing to the Brownian motion during the moving of the light detection region through the predetermined route, namely, the deviation time from the moving cycle time is generated. Then, in the present invention, based on the above-mentioned deviation time from the moving cycle time of a light detection region in the intervals of generation times of periodically detected signals, it is tried to compute out the moving easiness owing to the Brownian motion i.e., a diffusion characteristic value of a light-emitting particle.
  • the generation times of periodically detected signals of a light-emitting particle and the diffusion constant of the light-emitting particle are associated with one another as in the following.
  • ⁇ t is the difference of the times of encompassing the light-emitting particle in the light detection region owing to the moving of the position of the light-emitting particle, namely, the deviation time from the moving cycle time of the light detection region in the interval of the generation times of two signals ( ⁇ t may be positive or negative.).
  • the moving cycle time tcycle of a light detection region is to be so adjusted that the (three dimensional) displacement 1 of a light-emitting particle in the moving cycle time tcycle of the light detection region will not exceed the diameter 2r of the light detection region as illustrated in Fig. 3 (D) .
  • the moving cycle time tcycle of a light detection region may be adjusted so that the conditions of the above-mentioned Expression (6) will be satisfied for the expected diffusion constant of a light-emitting particle to be tested.
  • Fig. 1 (A) concretely, there are conducted (1) a process of preparation of a sample solution containing light-emitting particles, (2) a process of measuring the light intensity of a sample solution and (3) a process of analyzing the measured light intensity.
  • Fig. 4 shows the operation processes in this embodiment in the form of a flow chart.
  • the particle to be observed in the inventive method may be an arbitrary particle as long as it is dispersed in a sample solution and moving at random in the solution, such as a dissolved molecule, and the particle may be, for instance, a biological molecule, i.e. a protein, a peptide, a nucleic acid, a lipid, a sugar chain, an amino acid, etc. or an aggregate thereof, a virus, a cell, a metallic colloid or other non-biological particle (Typically, the sample solution is an aqueous solution, but not limited to this, and it may be an organic solvent or other arbitrary liquids.).
  • a biological molecule i.e. a protein, a peptide, a nucleic acid, a lipid, a sugar chain, an amino acid, etc. or an aggregate thereof, a virus, a cell, a metallic colloid or other non-biological particle
  • the sample solution is an aqueous solution, but not limited to this, and it may be an organic solvent
  • the particle to be observed may be a particle which emits light by itself, or may be a particle to which a light emitting label (a fluorescence molecule, a phosphorescence molecule, and a chemiluminescent or bioluminescent molecule) is attached in an arbitrary manner.
  • a light emitting label a fluorescence molecule, a phosphorescence molecule, and a chemiluminescent or bioluminescent molecule
  • the computer 18 executes programs (the process of changing the optical path in order to move the position of the light detection region in the sample solution, and the process of detecting light from the light detection region during the moving of the position of the light detection region) memorized in a storage device (not shown), and then illuminating the light detection region in the sample solution with the excitation light and measuring light intensity will be started.
  • the photodetector 16 sequentially converts the detected light into an electric signal and transmits it to the computer 18, which generates the time series light intensity data from the transmitted signals and store it in an arbitrary manner.
  • the photodetector 16 is typically a super high sensitive photodetector which can detect an arrival of a single photon, and thus the detection of light may be the photon counting performed in the manner of measuring sequentially the number of photons which arrive at the photodetector for every predetermined unit time (BIN TIME), for example, every 10 ⁇ s, during a predetermined time, and accordingly the time series light intensity data will be a time series photon count data.
  • BIN TIME predetermined unit time
  • the moving speed of the position of the light detection region during light intensity measurement is set to a value quicker than the moving speed in the random motion, i.e., the Brownian motion of a light-emitting particle.
  • the moving speed of the position of the light detection region is slower than the movement of a particle owing to the Brownian motion, the particle moves at random in the region as schematically drawn in Fig.
  • the moving speed of the position of the light detection region is set to be quicker than the average moving speed of a particle by the Brownian motion (diffusional moving velocity) so that the particle will cross the light detection region in an approximately straight line and thereby the profile of the change of the light intensity corresponding to each particle becomes almost uniform in the time series light intensity data (When a light-emitting particle passes through the light detection region in an approximately straight line, the profile of the light intensity change is similar to the excitation light intensity distribution. See the upper row of Fig. 6 (A) .) and the correspondence between each light-emitting particle and light intensity can be easily determined.
  • the moving speed of the position of the light detection region may be set to a value sufficiently quicker than Vdif.
  • Vdif will be 1.0x10 -3 m/s
  • supposing r is about 0.62 ⁇ m
  • the moving speed of the position of the light detection region may be set to its approximate 10 times, 15 mm/s.
  • an appropriate moving speed of the position of the light detection region may be determined by repeating the executions of a preliminary experiment with setting various moving speeds of the position of the light detection region in order to find the condition that the profile of a light intensity variation becomes an expected profile (typically, similar to the excitation light intensity distribution).
  • the moving cycle time tcycle of a light detection region is set so that the condition of Expression (6) should be satisfied for the diffusion constant D of a light-emitting particle to be tested.
  • the moving route of a light detection region is circular as illustrated in Fig. 3 (A)
  • time series light intensity data of a light-emitting particle in a sample solution is obtained by the above-mentioned processes, detection of a signal corresponding to light from a light-emitting particle on the light intensity data; extraction of signals of the same light-emitting particle and calculation of its diffusion constant may be performed in the computer 18 through processes in accordance with programs memorized in a storage device.
  • the light intensity variation in the signal corresponding to the particle to be observed in the time series light intensity data has a bell shaped profile reflecting the light intensity distribution in the light detection region (determined by the optical system) (See Fig. 8 (B) ).
  • the signal having the profile of the light intensity may be judged to correspond to one particle having passed through the light detection region, and thereby one light-emitting particle is detected.
  • a signal whose time width for which the light intensity exceeding the threshold value Io continues is not in the predetermined range is judged as noise or a signal of a contaminant.
  • a smoothing treatment is performed to the time series light signal data ( Fig. 6(A) , the upper row "detected result (unsettled)") ( Fig. 4 - step 110, Fig. 6(A) mid-upper row "smoothing").
  • the smoothing treatment may be done, for example, by the moving average method, etc.
  • parameters in performing the smoothing treatment e.g., the number of datum points in one time of the averaging, the number of times of a moving average, etc. in the moving averages method, may be appropriately set in accordance with the moving speed (scanning speed) of the position of the light detection region and/or BIN TIME in the light intensity data acquisition.
  • the first differentiation value with time of the time series light intensity data after the smoothing treatment is computed (step 120).
  • the mid-low row "time differential" in the time differential value of time series light signal data the variation of the value increases at the time of the signal value change, and thereby, the start point and the end point of a significant signal can be determined advantageously by referring to the time differential value.
  • a significant pulse signal is detected sequentially on the time series light intensity data, and it is judged whether or not the detected pulse signal is a signal corresponding to a light-emitting particle.
  • the start point and the end point of one pulse signal are searched and determined by referring to the time differential value sequentially, so that a pulse existing region will be specified (step 130).
  • the fitting of a bell-shaped function is applied to the smoothed time series light intensity data in the pulse existing region ( Fig.
  • the bell-shaped function to be used in the fitting is typically a Gauss function, it may be a Lorentz type function.
  • step 150 it is judged whether or not the computed parameters of the bell-shaped function are within the respective ranges assumed for the parameters of the bell-shaped profile drawn by a pulse signal detected when one light-emitting particle passes a light detection region, i.e., whether or not each of the peak intensity, the pulse width and the correlation coefficient of the pulse is within the corresponding predetermined range (step 150). Then, the signal, whose computed parameters of the bell-shaped function are judged to be within the ranges assumed in a light signal corresponding to one light-emitting particle, as shown in Fig. 6(B) left, is judged as a signal corresponding to one light-emitting particle, and thereby, one light-emitting particle will be detected.
  • a pulse signal whose computed parameters of the bell-shaped function are not within the assumed ranges, as shown in Fig. 6(B) right, is disregarded as noise.
  • the search and judgment of a pulse signal in the processes of the above-mentioned steps 130-150 may be repetitively carried out in the whole region of the time series light signal data (Step 160). Also, the process of detecting individually signals of light-emitting particles from time series light intensity data may be conducted by an arbitrary way other than the above-mentioned way.
  • the extraction of signals of the same light-emitting particle from those pulse signals will be conducted.
  • a signal of the same light-emitting particle appears continuously at each cycle time almost equal (not completely equal) to the moving cycle time of the light detection region.
  • the extraction of signals of the same light-emitting particle may be conducted by selecting a signal which appears continuously at each cycle time almost equal to the moving cycle time of the light detection region by an arbitrary way or algorithm.
  • the signals of the same light-emitting particle may be extracted by an experimenter specifying a signal which appears continuously on the time series light intensity data at each cycle time almost equal to the moving cycle time of the light detection region by visual observation.
  • the moving cycle time of the light detection region is adjusted (see Expression (6)) at a level that the (average) displacement of a light-emitting particle to be an observation object in each circulation of the light detection region does not exceed the size of the light detection region. In that case, the position of a once detected light-emitting particle after the circulation of the light detection region is expected to be within the size of the light detection region.
  • an algorithm to judge a signal generated on time series light intensity data within the range of a time width ⁇ T centering at a time obtained by adding a cycle time of a light detection region to the generation time of one signal of a light-emitting particle as a signal of the same light-emitting particle as the light-emitting particle corresponding to said one signal. More concretely, as schematically illustrated in Fig.
  • the signal ⁇ (ii) is chosen as a signal of the same light-emitting particle as the signal ⁇ (i).
  • the signal ⁇ (iii) is chosen as a signal of the same light-emitting particle as the already selected signals ⁇ (i) and ⁇ (ii).
  • Fig. 7 (A) when two or more light-emitting particles enter into the passing region of a light detection region, as illustrated in Fig. 7 (A) , between a certain group ( ⁇ ) of signals appearing periodically, there will appear another group ( ⁇ ) of signals appearing periodically.
  • signals may be extracted sequentially according to the same algorithm as the above. Namely, in a case that two or more groups of signals which appear periodically exist on one time series light intensity data, those signal groups may be extracted individually, respectively.
  • displacements of the light-emitting particle are estimated based on deviation times from the moving cycle time of the light detection region in the intervals of the generation times of the respective signals.
  • the deviation time ⁇ t may be computed with Expression (13) and the displacement x of the light-emitting particle in the interval of the generation times of the respective signals may be computed by multiplying the computed ⁇ t by the moving speed v of the light detection region (Expression (4)). For example, as in Fig.
  • the diffusion constant D of the light-emitting particle is computed using the relation of Expression (5).
  • the diffusion constant is a physical property reflecting the size and shape of a particle, and therefore, according to this invention, by attaching a light emitting label to an arbitrary particle to make it a light-emitting particle and measuring the diffusion constant of this light-emitting particle, it becomes possible to acquire the information about the size, structure or their change(s) of the particle wanted to observe, or various intermolecular interactions.
  • the measurable magnitude of the diffusion constant can be changed by adjusting the moving cycle time of a light detection region, and therefore, it is expected that the diffusion constants of the comparatively wide range of kinds of particles are measurable.
  • the moving cycle time of a light detection region may be adjusted to a suitable value through a preliminary experiment so that the periodic signals of a particle to be observed can be acquired.
  • plasmids pBR322, Takara Bio , Inc., Cat.No.3035
  • SYTOX Orange Invitrogen Corp., Cat.No.S-11368, at 10nM.
  • SYTOX Orange is a fluorescent dye which exhibits 500 times increase of fluorescence intensity when it binds with DNA (plasmid).
  • a single molecule fluorescence measuring apparatus MF20 (Olympus Corporation), equipped with the optical system of a confocal fluorescence microscope and a photon counting system, was used as the optical analysis device, and a time series light intensity data (photon count data) was acquired for the above-mentioned sample solution in accordance with the manner explained in the above-mentioned " (2) Measurement of the light intensity of a sample solution".
  • a 633-nm laser light was used for excitation light, and, using a band pass filter, the light of the wavelength band of 660 to 710 nm, was measured, and a time series light intensity data was generated.
  • the light detection region was made circulate a circular route (radius was about 23.9 ⁇ m.) with the moving cycle time of 10 msec. at 15 mm / second. And, BIN TIME was set to 10 ⁇ sec.; and the measurement time was set to 2 seconds.
  • Fig. 8 (A) shows examples of signals 1-5, indicating light of a light-emitting particle, which appeared periodically at about 10 m seconds (which was the moving cycle of the light detection region) in the data of 1.5 to 1.6 seconds in the light intensity data obtained in the above-mentioned measurement for 2 seconds.
  • All the signal were of an almost bell shaped pulse form signal as shown in Fig. 8 (B) .
  • the peak time of each of the above-mentioned signals was as follows (the unit is m seconds). Signal 1 1510.741 Signal 2 1520.726 Signal 3 1530.738 Signal 4 1540.767 Signal 5 1550.825
  • FIG. 8 (C) is a diagram in which the square values (x 2 ) of the displacements x thus computed are plotted against time (the number of cycles ⁇ the moving cycle time) (Each point is the average of the square values of the displacements x in each time.).
  • the average of square values x 2 of the displacements x was almost proportional to the time.
  • Expression (5) the relation between the average of square values x 2 of the displacements x and the time, expressed with Expression (5), was established, and thus, the displacements x of a light-emitting particle owing to the Brownian motion is computable based on the deviation time ⁇ t from time equivalent to the moving cycle time in the interval of the generation times of the above-mentioned signals.
  • This number of the groups of signals is equivalent to the number of light-emitting particles, and therefore, in the case of the present embodiment, the values of the diffusion constants of 1708 light-emitting particles were obtained in one light intensity data of the measurement for 2 seconds.
  • the diffusion constants were computed to be 9.9 ⁇ 10 -12 [m 2 /s] in average.
  • the diffusion constant of a particle to be observed obtained by performing a measurement (with a single molecule fluorescence measuring apparatus MF-20) by FCS for a solution containing the above-mentioned particle to be observed (plasmid pbr322) in 10 nM was 4.0x10 -12 [m 2 /s].
  • the measurement of the diffusion constant of a light-emitting particle is achievable in the scanning molecule counting method.
  • the inventive method is designed to detect periodically generated signals of a light-emitting particle on light intensity data individually and compute the diffusion constant based on the generation times of the signals, and therefore, according to the inventive method, even when a light-emitting particle concentration in a sample solution is lower than the concentration range requested in optical analysis techniques, such as FCS, the measurement of the diffusion constant of a light-emitting particle is possible, and this feature will be advantageous in a case of performing an analysis of a rare or expensive sample often used in the field of research and development of Medicine and Biology.
  • a diffusion constant is computed based on the generation times of periodically generated signals of a light-emitting particle on one-dimensional light intensity data, and thus, the load in computing is comparatively low, so that it is expected that the operation amount or time taken in calculation of the diffusion constant of one light-emitting particle is reduced as compared with the way of using image processing, such as SMT.
  • a diffusion characteristic value other than the diffusion constant is computable based on the deviation times from the moving cycle time of the light detection region in the intervals of the generation times of signals, and such a case also belong to the scope of the present invention.
  • an inclination of plots of square values of displacements of a particle against the time or a translational diffusion time computed based on "the deviation time from the moving cycle of the light detection region in the interval of the generation time of a signal" may be computed to be used for estimation of the size or structural change of a particle or an intermolecular interaction
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